CAS number : 7757-79-1
Molecular Weight: 101.1
Chemical Formula: KNO3
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Potassium nitrate is a colorless rhombohedral or trigonal solid, KNO3, soluble in water and decomposes at 400C. It occurs naturally as nitre and may be prepared by the reaction of sodium nitrate with potassium chloride followed by fractional crystallization. It is a powerful oxidizing agent (releases oxygen on heating) and is used in gunpowder and fertilizers.
Potassium Nitrate is used in the manufacture of various types of Glass, Explosive-Blasting powder, Slurry, Dynamics, Matches, Fertilizers, Heat Treatment & Heat transfer salts and Leather processing Industries. Major uses of potassium nitrate are in fertilizers, rocket propellants and fireworks. It is one of the constituents of gunpowder. When used as a food additive in the European Union, the compound is referred to as E252.
Appearance: Potassium Nitrate is available in a white crystalline form.
|Appearance||White crystalline powder|
|Assay (as KNO3)||99.50 % min|
|K 2 O||46.500 % min|
|Nitrogen||13.800 % min|
|Sulphate (as SO 4 )||0.005 % max|
|Chloride (as Cl)||0.005 % max|
|Iron (as Fe)||0.001 % max|
|Heavy Metal (as Pb)||0.0002 % max|
|Appearance||White crystalline powder|
|Assay (as KNO3)||99.000 % min|
|K 2 O||46.250 % min|
|Nitrogen||13.700 % max|
|Sulphate (as SO 4 )||0.010 % max|
|Chloride (as Cl)||0.05 % max|
|Iron (as Fe)||0.002 % max|
|Heavy Metal (as Pb)||0.0003 % max|
Potassium Nitrate is packed 50kg in HDPE laminated bags or as required by the buyer.
Potassium is used in the manufacture of various types of Glass, Explosive-Blasting powder. Slurry, Dynamics, Matches, Fertilizers, Heat Treatment & Heat transfer salts and Leather processing Industries.
Potassium nitrate is mainly used in fertilizer a s, as a source of nitrogen and potassium – two of the macro nutrients.
Potassium nitrate is also one of the three components of black powder, along with powdered charcoal (substantially carbon) and sulfur, where it acts as an oxidizer.
In the process of food preservation, potassium nitrate has been a common ingredient of salted meat since the Middle Ages.
Potassium nitrate is an efficient oxidizer, which produces a lilac-colored flame upon burning due to the presence of potassium. It is therefore used in amateur rocket propellants and in several fireworks such as smoke bombs, made with a mixture of sucrose and potassium nitrate. It is also added to pre-rolled cigarettes to maintain an even burn of the tobacco.
Potassium nitrate is the main component (usually about 98%) of tree stump remover, as it accelerates the natural decomposition of the stump. It is also commonly used in the heat treatment of metals as a solvent in the post-wash. The oxidizing, water solubility and low cost make it an ideal short-term rust inhibitor.
Potassium nitrate was used to ensure complete combustion of paper cartridges for cap and ball revolvers, as a treatment agent for the paper used to make the
cartridges. Potassium nitrate can be found in some toothpaste s for sensitive teeth. Potassium nitrate successfully combats high blood pressure and was once used as a hypotensive.
Potassium nitrate was once thought to induce impotence, and is still falsely rumored to be in institutional food (such as military fare) as an anaphrodisiac however, there is no scientific evidence for such properties.
Potassium Nitrate USP Grade Specifications
Potassium nitrate---- [CAS Number 7757-79-1].
Potassium Nitrate contains not less than 99.0 percent and not more than 100.5 percent of KNO3.
Identification: A solution of it responds to the tests for Potassium and for Nitrate.
Chloride: A 500-mg portion of it shows no more chloride than corresponds to 0.21 mL of 0.020 N hydrochloric acid (0.03%).
Sulfate: Dissolve 100 mg of Potassium Nitrate in 10 mL of water, add 15 mL of 6 N hydrochloric acid, and evaporate to dryness on a steam bath. To the residue so obtained add 7 mL of 6 N hydrochloric acid, and evaporate to dryness on a steam bath. Dissolve the residue so obtained in about 35 mL of water and, if necessary, neutralize with hydrochloric acid using litmus paper indicator. Filter, if necessary, to obtain a clear test solution. This test solution shows no more sulfate than corresponds to 0.10 mL of 0.020 N sulfuric acid (0.1%).
Arsenic: 3 ppm.
Lead: A solution of 0.5 g of it in 20 mL of water contains not more than 5 4g of lead (corresponding to not more than 0.001% of Pb).
Heavy metals: 0.002%.
Iron: not more than 0.001%.
Limit of sodium: the limit is 0.1%.
Limit of nitrite: To pass the test.
Potassium Nitrate BP Grade Specifications
CAS Number: 7757-79-1
Potassium nitrate contains not less than 99.0 per cent and not more than the equivalent of 101.0 per cent of KNO3, calculated with reference to the dried substance.
A white, crystalline powder or colourless crystals, freely soluble in water, very soluble in boiling water, practically insoluble in alcohol.
A. It gives the reaction of nitrates.
B. Solution S (see Tests) gives the reactions of potassium.
Solution S: Dissolve 10.0 g in carbon dioxide-free water prepared from distilled water and dilute to 100 ml with the same solvent.
Appearance of solution: Solution S is clear and colourless.
Acidity or alkalinity: To 10 ml of solution S add 0.05 ml of bromothymol blue solution. Not more than 0.5 ml of 0.01 M hydrochloric acid or 0.01 M sodium hydroxide is required to change the colour of the indicator.
Reducible substances: To 10 ml of solution S, add 0.5 ml of dilute sulphuric acid and 2 ml of zinc iodide and starch solution. The solution does not become blue within 2 min.
Chlorides: If intended for ophthalmic use, it complies with the test for chlorides. Dissolve 2.5 g in water and dilute to 15 ml with the same solvent. The solution complies with the limit test for chlorides (20 ppm).
Sulphates: Dilute 10 ml of solution S to 15 ml with distilled water. The solution complies with the limit test for sulphates (150 ppm).
Ammonium: 1 ml of solution S complies with the limit test (A) for ammonium (100 ppm). If intended for ophthalmic use, not more than 50 ppm of ammonium.
Calcium: Dilute 10 ml of solution S to 15 ml with distilled water. The solution complies with the limit test for calcium (100 ppm). If intended for ophthalmic use, not more than 50 ppm of calcium.
Iron: Dilute 5 ml of solution S to 10 ml with water. The solution complies with the limit test for iron (20 ppm). If intended for ophthalmic use, not more than 10 ppm of iron.
Sodium: Not more than 0.1 per cent of Na, determined by atomic emission spectrometry.
Heavy metals: 12 ml of solution S complies with limit test A for heavy metals (10 ppm).
Loss on drying: Not more than 0.5 per cent determined on 1.000 g by drying in an oven at 100C to 105C.
Potassium Nitrate FCC Food Grade Specifications
CAS Number: 7757-79-1
Potassium Nitrate occurs as colorless, transparent prisms, as white granules, or as a white, crystalline powder. It is slightly hygroscopic in moist air. One gram dissolves in 3 mL of water at 25°, in 0.5 mL of boiling water, and in about 620 mL of alcohol. Its solutions are neutral to litmus.
Function: Antimicrobial agent; preservative.
Identification: A 1:10 aqueous solution gives positive tests for Potassium and Nitrate.
Assay: Not less than 99.0% and not more than 100.5% of KNO3 after drying.
Chlorate: Sprinkle about 100 mg of dry sample on 1 mL of sulfuric acid. The mixture does not turn yellow.
Lead: Not more than 4 mg/kg.
Loss on Drying: Not more than 1%.
Potassium Nitrate ACS Analytical Reagent Grade Specifications
CAS Number: 7757-79-1
Assay: 99.0% KNO3
pH of a 5% solution: 4.5-8.5 at 25C
Insoluble matter: 0.005%
Chloride (Cl): 0.002%
Iodate (IO3): 5 ppm
Nitrite (NO2): 0.001%
Phosphate (PO4): 5 ppm
Sulfate (SO4): 0.003%
Heavy metals (as Pb): 5 ppm
Iron (Fe): 3 ppm
Calcium (Ca): 0.005%
Magnesium (Mg): 0.002%
Sodium (Na): 0.005%
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